* {
    padding: 0px;
    margin: 0px;
}

header {
    color: cornsilk;
    background-color: rgb(28, 208, 253);
    line-height: 55px;
    padding-left: 120px;
    padding-right: 120px;
}

.body {
    width: 100%;
    background-color: rgb(255, 255, 255);
}

footer {
    width: 100%;
    background-color: cyan;
}

.buju {
    padding: 0px 120px 0 120px;
}


/* 图标 */

.littelogo {
    vertical-align: middle;
    width: 55px;
    height: 50px;
}


/* 图标 */

a {
    text-decoration: none;
}

ul {
    list-style-type: none;
}

li {
    float: right;
}

li a {
    text-decoration: none;
    display: block;
    padding: 0 10px 0 10px;
    color: rgb(255, 255, 255);
}

li a:hover {
    background-color: blue;
}

.dropbtn {
    background-color: rgb(28, 208, 253);
    color: white;
    padding: 16px;
    font-size: 16px;
    border: none;
    cursor: pointer;
}

.dropdown {
    position: relative;
    display: inline-block;
}

.dropdown-content {
    display: none;
    position: absolute;
    right: 0;
    background-color: #f9f9f9;
    min-width: 160px;
    box-shadow: 0px 8px 16px 0px rgba(0, 0, 0, 0.2);
}

.dropdown-content a {
    color: black;
    padding: 5px;
    text-decoration: none;
    display: block;
}

.dropdown-content a:hover {
    background-color: blue;
}

.dropdown:hover .dropdown-content {
    display: block;
}

.dropdown:hover .dropbtn {
    background-color: blue;
}

.dropdown:hover .ri {
    background-color: blue;
}


/* 创建三个相等的列 */

.column {
    float: left;
    width: 25%;
    text-align: center;
    background-color: rgb(255, 255, 255);
}


/* 列后清除浮动 */

.row:after {
    content: "";
    display: table;
    clear: both;
}

.img {
    margin: 5px;
    border: 1px solid #ccc;
    padding: 5px;
    background-color: burlywood;
}

.img img {
    width: 100%;
}

.img:hover {
    border: 2px solid rgb(0, 0, 0);
    opacity: 0.5;
}

.desc {
    padding: 15px;
    text-align: center;
}

hr {
    margin: auto;
    width: 8%;
    height: 7px;
    background-color: black;
}

.margin50px {
    margin: 50px;
}

.borderbottom {
    border-bottom: 5px solid black;
    padding-top: 50px;
}

#erweima {
    width: 160px;
    height: 160px;
}

.textcenter {
    text-align: center;
}

.floatleft {
    float: left;
}

.floatright {
    float: right;
}

.buju .borderbottom .floatleft {
    width: 75%;
    float: left;
}

.buju .borderbottom .floatright {
    width: 25%;
    float: right;
}

.biaoti2 {
    text-align: center;
    line-height: 50px;
}

.lineh {
    line-height: 50px;
}